| 单词 | coaxial cable (coax) |
| 释义 | coaxial cable (coax) A very robust shielded copper cable. All components are symmetrically arranged around a common axis, or center point, hence the term coaxial. A coax cable has a relatively thick center conductor (in comparison to a twisted-pair conductor), generally solid, although stranded wire sometimes is used in applications requiring greater flex strength.The metal used for the inner conductor may be bare copper, silvered copper, tinned copper, copper-clad aluminum or copper-covered steel. A layer of dielectric material, either foam or solid, generally surrounds the inner conductor, serving to separate it from the single outer conductor, or sometimes two outer conductors.The conductor(s) comprising the outer shield generally consists of a solid aluminum foil, although a braided or stranded metal screen of aluminum, bare copper, silvered copper, copper-clad aluminum, or tinned copper may be used. The entire cable is then protected by a sheath of dielectric material such as PVC or Teflon®. Coaxial cable types are identified by RG (Radio Guide) number. Invented by AT&T Bell Telephone Laboratories in 1934, the first coaxial cables were hollow tubes about one-quarter inch in diameter. A single copper wire ran down the center of each pipe and was held in place by insulating discs. The pipes were in pairs, with one for transmission in each direction.The first coaxial system was placed into service in New York City in 1936. See also flex strength, ScTP, shield, STP, and twinaxial cable. See also RG for a listing of example coaxial cable types. Center conductor Shield Braid Jacket Core insulation |
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